Updated FindCorrade.cmake from Corrade repository.
Work around missing types in NaCl's `gl2.h`.
Merge branch 'master' into compatibility
GCC 4.4 compatibility: fix linker errors with =default.
Shaders: oops.
Text: actually have some sane default plugin dir.
Text: fix error in fontconverter utility documentation.
Math: work around missing std::round() in NaCl newlib.

Also test that our implementation behaves the same.
Merge branch 'master' into compatibility
Platform: add at least some support for wheel events to NaClApplication.

In NaCl the wheel event is something completely different than mouse
event and in my opinion overly complicated (the scrolled distance is
measured in pixel precision!).

To preserve at least some compatibility with other toolkits, the events
are shoved into normal MouseEvent. Sadly the event doesn't contain any
position information.
external: updated Optional with Native Client support.
Merge branch 'master' into compatibility